feat(ai-tool): expose OpenSERP to n8n agents

[ALIENvsROBOT]

Summary

• Expose the existing OpenSERP app node as OpenSERP Tool for n8n AI Agents.
• Document how to use model-controlled parameters for searches and extraction while keeping credentials, operations, limits, and execution settings owned by the workflow.
• Document the correct self-hosted Base URL format and cap the result limit at 100.
• Bump the package version to 0.2.0.

Why

The community package currently provides only the standard workflow node. Marking the node as usableAsTool lets n8n generate the AI-tool variant from the same package, without duplicating the implementation.

Validation

• Verified a self-hosted OpenSERP API for health, readiness, web search, image search, multi-engine search, single extraction, and batch extraction.
• Verified the package manifest and TypeScript syntax.
• Verified the package dry-run output contains the OpenSERP node source.

Closes #1

[ALIENvsROBOT]

@karust would be nice if you could review and merge this change thanks 😎

[ramgalin]

Thanks @ALIENvsROBOT for this. The issue is well specified.
I ran CI steps locally against 56545c6 and the lint step (npm run lint) has failed:

105:3  Add final period            node-param-description-missing-final-period
114:4  Remove `maxValue`           node-param-type-options-max-value-present
207:5  Replace with "['main']"     node-class-description-inputs-wrong-regular-node
208:5  Replace with "['main']"     node-class-description-outputs-wrong

All four lint errors are introduced by this PR — main is currently lint-clean. Lint is a required step in .github/workflows/ci.yml, so this would go red once the workflow is approved to run. Details are in the inline comments.

[ALIENvsROBOT]

@ramgalin @karust please do publish latest release so I could use openserp as tool 😃

Thanks

[ramgalin]

@ALIENvsROBOT done.
Sorry, distracted by the daily job routine and it slipped my mind :)